Operating and Installation Conditions
Environmental Conditions
Ambient Temperature
PowerPacT B-frame circuit breakers may be used between -13°F (-25°C) and 158°F (+70°C).
For temperatures higher than 104°F (40°C) inside the enclosure, devices must be derated.
Circuit breakers should be put into service under normal ambient, operating temperature conditions.
Exceptionally, the circuit breaker may be put into service when the ambient temperature is between -31°F (-35°C) and -13°F (-25°C).
The permissible storage-temperature range for PowerPacT B-frame circuit breakers in the original packing is -67°F (-50°C) and 185°F (+85°C).
Altitude Derating
Altitude does not significantly affect the characteristics of PowerPacT B-frame circuit breakers up to 2000 m (6560 ft). Above this altitude, it is necessary to take into account the decrease in the dielectric strength and cooling capacity of air.
The following table gives the corrections to be applied for altitudes above 2000 m (6560 ft).
The breaking capacities remain unchanged.
|
Altitude |
6560
ft |
9840
ft |
13120
ft |
16400 ft |
|
|---|---|---|---|---|---|
|
Impulse withstand voltage (kV) |
8 |
7.1 |
6.4 |
5.6 |
|
|
Insulation voltage (V) |
Ui |
800 |
710 |
635 |
560 |
|
Maximum operational voltage (V) |
Ue |
690 |
690 |
635 |
560 |
|
Average current capacity (A) at 104°F (40°C) |
In x |
1.0 |
0.98 |
0.96 |
0.94 |
Vibrations
PowerPacT B-frame devices resist mechanical vibrations.
They meet following levels of IEC 60068-2-6:
-
2.0 to 25 Hz and amplitude ±1.6 mm.
-
25 to 100 Hz acceleration ±4 g.
Excessive vibration may cause tripping, breaks in connections or damage to mechanical parts.
Climatic Withstand
The materials used in PowerPacT B-frame circuit breakers will not support the growth of fungus and mold.
PowerPacT B-frame circuit breakers have passed the test defined below for extreme atmospheric conditions.
Dry cold and dry heat:
-
IEC 60068-2-1-dry cold at -67°F (-55°C).
-
IEC 60068-2-2-dry heat at 185°F (+85°C).
Damp heat (tropicalization):
-
IEC 60068-2-30–damp heat (temperature 131°F (+ 55°C) and relative humidity of 95%).
-
IEC 60068-2-52 severity 2 - Cycling salt mist.
Electromagnetic Disturbances
PowerPacT B-frame circuit breakers have successfully passed the electromagnetic compatibility tests (EMC) defined by the following international standards: IEC/EN 60947-2: Low-voltage switchgear and controlgear, part 2: circuit breakers.
PowerPacT B-frame circuit breakers are protected against:
-
Overvoltages caused by circuit switching.
-
Overvoltages caused by an atmospheric disturbances or by a distribution-system outage (such as from failure due to lightning).
-
Devices emitting radio waves (radios, walkie-talkies, radar, etc.).
-
Electrostatic discharges produced directly by users.
Shunt Trip (MX) and Undervoltage Release (MN) Wiring Rules
Recommended Maximum Cable Lengths
In certain circumstances, high cable capacitance (C) due to an excessive cable length could prevent an undervoltage release MN from dropping out. In case of a shunt trip MX, an untimely trip may occur due to capacitive current leak.
To avoid problems due to excessive cable capacitance (C), the maximum cable length (L) is defined by the following table for a 1.5 mm² cable (#16 AWG).
Maximum Cable Length
|
Power Supply Voltage (Vn) |
Maximum Cable Length |
|
|---|---|---|
|
Undervoltage Trip (MN) * |
Shunt Trip (MX) * |
|
|
24 Vac |
4,078 ft (1 243 m) |
11,985 ft (3 653 m) |
|
24 Vdc |
Unlimited |
11,985 ft (> 3653 m) |
|
48 Vac |
1912 ft (583 m) |
5,469 ft (1 667 m) |
|
48 Vdc |
Unlimited |
5,469 ft (> 1667 m) |
|
110...130 Vac |
413 ft (126 m) |
2,995 ft (913 m) |
|
110...130 Vdc |
Unlimited |
2,995 ft (> 913 m) |
|
208-240 ac |
358 ft (109 m) |
525 ft (160 m) |
|
250 Vdc |
Unlimited |
525 ft (> 160 m) |
|
277 Vac |
322 ft (98 m) |
394 ft (120 m) |
|
380-415 Vac |
282 ft (86 m) |
262 ft (80 m) |
|
440-480 Vac |
184 ft (56 m) |
220 ft (67 m) |
If a longer cable length is required, several solutions are possible to counteract excessive cable capacitance:
-
Use DC operated auxiliaries.
-
Use lower control voltage (make sure auxiliaries supply voltage is within working range: 0.85 Vn minimum–1.1 Vn maximum).
-
If high voltage and long control cables are required for an AC undervoltage release (MN), add a rectifier bridge (ref LV426899 – DIN rail compatible) in the control circuit. It will prevent drop out problems but increase operating time.
Electrical Characteristics of MN/MX
|
Characteristics |
AC |
DC |
||
|---|---|---|---|---|
|
Rated voltage (V) |
24, 48, 110–130, 208–240, 277, 380–415, 440–480 |
24, 48, 125, 250 |
||
|
Power requirements |
MX |
Pickup (< 50 ms) |
< 6 VA |
< 10 W |
|
Seal-in |
< 4 VA |
< 1 W |
||
|
MN |
< 7 VA |
< 2 W |
||
|
Clearing time (ms) |
< 50 |
< 50 |
||
|
Operating range |
Up to 1.1 Vn |
Up to 1.1 Vn |
||
Temperature Considerations
Correction Factor
The overload protection is calibrated at 104°F (40°C). This means that when the ambient temperature is less than or greater than 104°F (40°C), the In protection pick-up is slightly modified.
Derating Depending on the Temperature
Over the reference temperature of 104°F (40°C), the circuit breaker has to be derated following the table below:
Correction Factor Table for PowerPacT B-frame Circuit Breakers
|
Rating (In) |
Temperature (°C / °F ) |
||||||
|---|---|---|---|---|---|---|---|
|
40 / 104 |
45 / 113 |
50 / 122 |
55 / 131 |
60 / 140 |
65 / 149 |
70 / 158 |
|
|
15 |
15 |
14 |
14 |
13 |
12 |
12 |
11 |
|
20 |
20 |
19 |
19 |
18 |
18 |
17 |
16 |
|
25 |
25 |
24 |
24 |
23 |
22 |
21 |
20 |
|
30 |
30 |
29 |
28 |
27 |
26 |
25 |
24 |
|
35 |
35 |
34 |
33 |
32 |
31 |
31 |
30 |
|
40 |
40 |
39 |
38 |
37 |
36 |
35 |
33 |
|
45 |
45 |
44 |
42 |
41 |
39 |
37 |
36 |
|
50 |
50 |
49 |
47 |
45 |
44 |
42 |
40 |
|
60 |
60 |
58 |
56 |
55 |
53 |
51 |
48 |
|
70 |
70 |
67 |
64 |
61 |
59 |
55 |
53 |
|
80 |
80 |
77 |
73 |
70 |
67 |
63 |
59 |
|
90 |
90 |
87 |
83 |
80 |
76 |
72 |
68 |
|
100 |
100 |
99 |
96 |
92 |
85 |
80 |
69 |
|
110 |
110 |
107 |
103 |
99 |
94 |
89 |
76 |
|
125 |
125 |
121 |
117 |
112 |
109 |
104 |
100 |
Calculating Tripping Time
Calculating the Tripping Time for a Given Temperature:
After having determine the corrected ratio I/In, the tripping time at 104°F (40°C) is defined with the tripping curves (Trip Curves). Then to obtain the tripping time at a different temperature, the ratio I/In has to be corrected with the correction factor below:
Correction Factor Table for PowerPacT B–Frame Circuit Breakers
|
Rating (In) |
Temperature °F (°C ) |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
50 |
59 |
68 |
77 |
86 |
95 |
104 (40) |
113 (45) |
122 (50) |
131 (55) |
140 (60) |
149 (65) |
158 (70) |
|
|
15 |
1.21 |
1.18 |
1.15 |
1.11 |
1.05 |
1.04 |
1 |
0.96 |
0.92 |
0.87 |
0.83 |
0.78 |
0.72 |
|
20 |
1.16 |
1.13 |
1.11 |
1.08 |
1.06 |
1.03 |
1 |
0.97 |
0.94 |
0.91 |
0.88 |
0.85 |
0.81 |
|
25 |
1.15 |
1.13 |
1.11 |
1.08 |
1.05 |
1.03 |
1 |
0.97 |
0.94 |
0.91 |
0.88 |
0.85 |
0.82 |
|
30 |
1.16 |
1.14 |
1.11 |
1.08 |
1.06 |
1.03 |
1 |
0.97 |
0.94 |
0.91 |
0.87 |
0.84 |
0.80 |
|
35 |
1.13 |
1.11 |
1.09 |
1.07 |
1.05 |
1.02 |
1 |
0.98 |
0.95 |
0.93 |
0.90 |
0.87 |
0.85 |
|
40 |
1.14 |
1.12 |
1.10 |
1.07 |
1.05 |
1.03 |
1 |
0.97 |
0.95 |
0.92 |
0.89 |
0.86 |
0.83 |
|
45 |
1.17 |
1.15 |
1.12 |
1.09 |
1.06 |
1.03 |
1 |
0.97 |
0.94 |
0.90 |
0.87 |
0.83 |
0.79 |
|
50 |
1.16 |
1.14 |
1.11 |
1.08 |
1.06 |
1.03 |
1 |
0.97 |
0.94 |
0.91 |
0.87 |
0.84 |
0.80 |
|
60 |
1.16 |
1.14 |
1.11 |
1.08 |
1.06 |
1.03 |
1 |
0.97 |
0.94 |
0.91 |
0.88 |
0.84 |
0.81 |
|
70 |
1.18 |
1.15 |
1.13 |
1.10 |
1.06 |
1.03 |
1 |
0.96 |
0.91 |
0.88 |
0.84 |
0.79 |
0.75 |
|
80 |
1.19 |
1.15 |
1.12 |
1.09 |
1.06 |
1.03 |
1 |
0.96 |
0.92 |
0.88 |
0.83 |
0.79 |
0.74 |
|
90 |
1.19 |
1.15 |
1.12 |
1.10 |
1.06 |
1.04 |
1 |
0.96 |
0.92 |
0.89 |
0.84 |
0.80 |
0.75 |
|
100 |
1.21 |
1.18 |
1.15 |
1.12 |
1.09 |
1.05 |
1 |
0.99 |
0.96 |
0.92 |
0.85 |
0.80 |
0.69 |
|
110 |
1.19 |
1.16 |
1.13 |
1.10 |
1.07 |
1.04 |
1 |
0.98 |
0.94 |
0.90 |
0.85 |
0.80 |
0.70 |
|
125 |
1.17 |
1.14 |
1.12 |
1.09 |
1.06 |
1.03 |
1 |
0.96 |
0.94 |
0.90 |
0.87 |
0.83 |
0.80 |
Installation and Operating Conditions
Protection Degree
Protection Degree of the Product (According to IEC60259, Protection Degree Depends on Configuration)
|
Colors |
Definition |
|---|---|
|
IP 54/65: side / front extended rotary handle |
|
|
IP 40: front cover, side, back, long terminal shield, direct rotary handle |
|
|
IP20: mounting screws cover |
|
|
May be IP20 or less depending of the kind of power connections and cable size used (cable outside diameter (OD) including insulation to be greater than 200 mils) |
|
|
|
Reverse Feeding
PowerPacT B-frame circuit breakers can be supplied from either the top or the bottom without any reduction in performance giving the designer/installer flexibility in choosing the mounting location for the breaker and feed cables.
All connection and insulation accessories can be used on circuit breakers supplied either from the top or bottom.